That鈥檚 right, in late January that sales of Kindle e-books are outpacing paperback sales. For every 100 paperbacks sold in 2010, Amazon sold 115 Kindle e-books. Kindle e-books had already started outselling hardcover books in July 2010 (for every 100 hardcover books, Amazon said it sold 143 e-books). That means e-books are the most popular format on Amazon, one of the biggest booksellers in the country.
AP
Amazon's customers now buy more e-books than either hardbacks or paperbacks.